Hello everyone! I've decided to finally contribute to this forum by making a hack that hopefully you guys will enjoy, and yes this will be more than just an idea. This hack will be based off Mario and Luigi: Superstar Saga and the stages will also be based off the locations of which are in the game.

Here are some screenshots of some test stages I've built to give a representation of what the stages will look like, soon to use sprites (turning them into textures) from the original game!

Did you happen to use Skelux's Multiplayer 1.2 or 1.3? I recommend you make the hack for multiplayer and ideally completed only through multiplayer requiring luigi. You could take advantage of the fact Mupen64K(++) can save the game progess unlike PJ64k which skelux used.